參數(shù)資料
型號： ADSP-BF531SBST400
廠商： ANALOG DEVICES INC
元件分類： 數(shù)字信號處理
英文描述： Circular Connector Series:97
中文描述： 16-BIT, 40 MHz, OTHER DSP, PQFP176
封裝： 24 X 24 MM, LQFP-176
文件頁數(shù)： 45/56頁
文件大小： 671K
代理商： ADSP-BF531SBST400
ADSP-BF531/ADSP-BF532/ADSP-BF533
Rev. 0
|
Page 45 of 56
|
March 2004
ENVIRONMENTAL CONDITIONS
To determine the junction temperature on the application
printed circuit board use:
where:
T
J
= Junction temperature ( C)
T
CASE
= Case temperature ( C) measured by customer at top
center of package.
Ψ
JT
= From
Table 33
P
D
= Power dissipation (see
Power Dissipation on Page 41
for
the method to calculate P
D
)
Values of
θ
JA
are provided for package comparison and printed
circuit board design considerations.
θ
JA
can be used for a first
order approximation of T
J
by the equation:
where:
T
A
= Ambient temperature ( C)
In
Table 33
, airflow measurements comply with JEDEC stan-
dards JESD51-2 and JESD51-6, and the junction-to-board
measurement complies with JESD51-8. The junction-to-case
measurement complies with MIL-STD-883 (Method 1012.1).
All measurements use a 2S2P JEDEC test board.
Thermal resistance
θ
JA
in
Table 33
is the figure of merit relating
to performance of the package and board in a convective envi-
ronment.
θ
JMA
represents the thermal resistance under two
conditions of airflow.
θ
JB
represents the heat extracted from the
periphery of the board.
Ψ
JT
represents the correlation between
T
J
and T
CASE
. Values of
θ
JB
are provided for package compari-
son and printed circuit board design considerations.
Table 33. Thermal Characteristics for BC-160 Package
Parameter
θ
JA
θ
JMA
θ
JMA
θ
JB
θ
JC
Ψ
JT
Condition
0 Linear m/s Airflow
1 Linear m/s Airflow
2 Linear m/s Airflow
Not applicable
Not applicable
0 Linear m/s Airflow
Typical
34.1
30.1
28.8
25.55
8.75
0.13
Unit
C/W
C/W
C/W
C/W
C/W
C/W
Table 34. Thermal Characteristics for ST-176-1 Package
Parameter
θ
JA
θ
JMA
θ
JMA
Ψ
JT
Ψ
JT
Ψ
JT
Condition
0 Linear m/s Airflow
1 Linear m/s Airflow
2 Linear m/s Airflow
0 Linear m/s Airflow
1 Linear m/s Airflow
2 Linear m/s Airflow
Typical
34.9
33.0
32.0
0.50
0.75
1.00
Unit
C/W
C/W
C/W
C/W
C/W
C/W
T
J
T
CASE
Ψ
JT
P
D
×
(
)
+
=
T
J
T
A
θ
JA
P
D
×
(
)
+
=
Table 35. Thermal Characteristics for B-169 Package
Parameter
θ
JA
θ
JMA
θ
JMA
θ
JB
θ
JC
Ψ
JT
Condition
0 Linear m/s Airflow
1 Linear m/s Airflow
2 Linear m/s Airflow
Not applicable
Not applicable
0 Linear m/s Airflow
Typical
28.6
24.6
23.8
21.75
12.7
0.78
Unit
C/W
C/W
C/W
C/W
C/W
C/W
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